local check_fields = function()

in kong/kong/db/schema/metaschema.lua [415:466]

• 50 lines of code
• 13 McCabe index (conditional complexity)

local check_fields = function(schema, errors)
  local transformations = schema.transformations
  if transformations then
    for i = 1, #transformations do
      local transformation = transformations[i]
      for j = 1, #transformation.input do
        local input = transformation.input[j]
        if not has_schema_field(schema, input) then
          errors.transformations = errors.transformations or {}
          errors.transformations.input = errors.transformations.input or {}
          errors.transformations.input[i] = errors.transformations.input[i] or {}
          errors.transformations.input[i][j] = fmt("invalid field name: %s", input)
        end
      end

      if transformation.needs then
        for j = 1, #transformation.needs do
          local need = transformation.needs[j]
          if not has_schema_field(schema, need) then
            errors.transformations = errors.transformations or {}
            errors.transformations.needs = errors.transformations.needs or {}
            errors.transformations.needs[i] = errors.transformations.needs[i] or {}
            errors.transformations.needs[i][j] = fmt("invalid field name: %s", need)
          end
        end
      end
    end
  end

  for i = 1, #schema.fields do
    local item = schema.fields[i]
    if type(item) ~= "table" then
      errors["fields"] = meta_errors.FIELDS_ARRAY
      break
    end
    local k = next(item)
    if not k then
      errors["fields"] = meta_errors.FIELD_EMPTY
      break
    end
    local field = item[k]
    if type(field) == "table" then
      check_field(k, field, errors)
    else
      errors[k] = meta_errors.TABLE:format(k)
    end
  end
  if next(errors) then
    return nil, errors
  end
  return true
end